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2 # WARNING: THIS FILE IS GENERATED BY 'src/generator.ml'.
3 # ANY CHANGES YOU MAKE TO THIS FILE WILL BE LOST.
5 # Copyright (C) 2009 Red Hat Inc.
7 # This library is free software; you can redistribute it and/or
8 # modify it under the terms of the GNU Lesser General Public
9 # License as published by the Free Software Foundation; either
10 # version 2 of the License, or (at your option) any later version.
12 # This library is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 # Lesser General Public License for more details.
17 # You should have received a copy of the GNU Lesser General Public
18 # License along with this library; if not, write to the Free Software
19 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 Sys::Guestfs - Perl bindings for libguestfs
31 my $h = Sys::Guestfs->new ();
32 $h->add_drive ('guest.img');
35 $h->mount ('/dev/sda1', '/');
41 The C<Sys::Guestfs> module provides a Perl XS binding to the
42 libguestfs API for examining and modifying virtual machine
45 Amongst the things this is good for: making batch configuration
46 changes to guests, getting disk used/free statistics (see also:
47 virt-df), migrating between virtualization systems (see also:
48 virt-p2v), performing partial backups, performing partial guest
49 clones, cloning guests and changing registry/UUID/hostname info, and
52 Libguestfs uses Linux kernel and qemu code, and can access any type of
53 guest filesystem that Linux and qemu can, including but not limited
54 to: ext2/3/4, btrfs, FAT and NTFS, LVM, many different disk partition
55 schemes, qcow, qcow2, vmdk.
57 Libguestfs provides ways to enumerate guest storage (eg. partitions,
58 LVs, what filesystem is in each LV, etc.). It can also run commands
59 in the context of the guest. Also you can access filesystems over FTP.
63 All errors turn into calls to C<croak> (see L<Carp(3)>).
77 XSLoader::load ('Sys::Guestfs');
79 =item $h = Sys::Guestfs->new ();
81 Create a new guestfs handle.
87 my $class = ref ($proto) || $proto;
89 my $self = Sys::Guestfs::_create ();
94 =item $h->add_cdrom ($filename);
96 This function adds a virtual CD-ROM disk image to the guest.
98 This is equivalent to the qemu parameter C<-cdrom filename>.
100 =item $h->add_drive ($filename);
102 This function adds a virtual machine disk image C<filename> to the
103 guest. The first time you call this function, the disk appears as IDE
104 disk 0 (C</dev/sda>) in the guest, the second time as C</dev/sdb>, and
107 You don't necessarily need to be root when using libguestfs. However
108 you obviously do need sufficient permissions to access the filename
109 for whatever operations you want to perform (ie. read access if you
110 just want to read the image or write access if you want to modify the
113 This is equivalent to the qemu parameter C<-drive file=filename>.
115 =item $h->aug_close ();
117 Close the current Augeas handle and free up any resources
118 used by it. After calling this, you have to call
119 C<$h-E<gt>aug_init> again before you can use any other
122 =item ($nrnodes, $created) = $h->aug_defnode ($name, $expr, $val);
124 Defines a variable C<name> whose value is the result of
127 If C<expr> evaluates to an empty nodeset, a node is created,
128 equivalent to calling C<$h-E<gt>aug_set> C<expr>, C<value>.
129 C<name> will be the nodeset containing that single node.
131 On success this returns a pair containing the
132 number of nodes in the nodeset, and a boolean flag
133 if a node was created.
135 =item $nrnodes = $h->aug_defvar ($name, $expr);
137 Defines an Augeas variable C<name> whose value is the result
138 of evaluating C<expr>. If C<expr> is NULL, then C<name> is
141 On success this returns the number of nodes in C<expr>, or
142 C<0> if C<expr> evaluates to something which is not a nodeset.
144 =item $val = $h->aug_get ($path);
146 Look up the value associated with C<path>. If C<path>
147 matches exactly one node, the C<value> is returned.
149 =item $h->aug_init ($root, $flags);
151 Create a new Augeas handle for editing configuration files.
152 If there was any previous Augeas handle associated with this
153 guestfs session, then it is closed.
155 You must call this before using any other C<$h-E<gt>aug_*>
158 C<root> is the filesystem root. C<root> must not be NULL,
161 The flags are the same as the flags defined in
162 E<lt>augeas.hE<gt>, the logical I<or> of the following
167 =item C<AUG_SAVE_BACKUP> = 1
169 Keep the original file with a C<.augsave> extension.
171 =item C<AUG_SAVE_NEWFILE> = 2
173 Save changes into a file with extension C<.augnew>, and
174 do not overwrite original. Overrides C<AUG_SAVE_BACKUP>.
176 =item C<AUG_TYPE_CHECK> = 4
178 Typecheck lenses (can be expensive).
180 =item C<AUG_NO_STDINC> = 8
182 Do not use standard load path for modules.
184 =item C<AUG_SAVE_NOOP> = 16
186 Make save a no-op, just record what would have been changed.
188 =item C<AUG_NO_LOAD> = 32
190 Do not load the tree in C<$h-E<gt>aug_init>.
194 To close the handle, you can call C<$h-E<gt>aug_close>.
196 To find out more about Augeas, see L<http://augeas.net/>.
198 =item $h->aug_insert ($path, $label, $before);
200 Create a new sibling C<label> for C<path>, inserting it into
201 the tree before or after C<path> (depending on the boolean
204 C<path> must match exactly one existing node in the tree, and
205 C<label> must be a label, ie. not contain C</>, C<*> or end
206 with a bracketed index C<[N]>.
208 =item $h->aug_load ();
210 Load files into the tree.
212 See C<aug_load> in the Augeas documentation for the full gory
215 =item @matches = $h->aug_ls ($path);
217 This is just a shortcut for listing C<$h-E<gt>aug_match>
218 C<path/*> and sorting the resulting nodes into alphabetical order.
220 =item @matches = $h->aug_match ($path);
222 Returns a list of paths which match the path expression C<path>.
223 The returned paths are sufficiently qualified so that they match
224 exactly one node in the current tree.
226 =item $h->aug_mv ($src, $dest);
228 Move the node C<src> to C<dest>. C<src> must match exactly
229 one node. C<dest> is overwritten if it exists.
231 =item $nrnodes = $h->aug_rm ($path);
233 Remove C<path> and all of its children.
235 On success this returns the number of entries which were removed.
237 =item $h->aug_save ();
239 This writes all pending changes to disk.
241 The flags which were passed to C<$h-E<gt>aug_init> affect exactly
244 =item $h->aug_set ($path, $val);
246 Set the value associated with C<path> to C<value>.
248 =item $h->blockdev_flushbufs ($device);
250 This tells the kernel to flush internal buffers associated
253 This uses the L<blockdev(8)> command.
255 =item $blocksize = $h->blockdev_getbsz ($device);
257 This returns the block size of a device.
259 (Note this is different from both I<size in blocks> and
260 I<filesystem block size>).
262 This uses the L<blockdev(8)> command.
264 =item $ro = $h->blockdev_getro ($device);
266 Returns a boolean indicating if the block device is read-only
267 (true if read-only, false if not).
269 This uses the L<blockdev(8)> command.
271 =item $sizeinbytes = $h->blockdev_getsize64 ($device);
273 This returns the size of the device in bytes.
275 See also C<$h-E<gt>blockdev_getsz>.
277 This uses the L<blockdev(8)> command.
279 =item $sectorsize = $h->blockdev_getss ($device);
281 This returns the size of sectors on a block device.
282 Usually 512, but can be larger for modern devices.
284 (Note, this is not the size in sectors, use C<$h-E<gt>blockdev_getsz>
287 This uses the L<blockdev(8)> command.
289 =item $sizeinsectors = $h->blockdev_getsz ($device);
291 This returns the size of the device in units of 512-byte sectors
292 (even if the sectorsize isn't 512 bytes ... weird).
294 See also C<$h-E<gt>blockdev_getss> for the real sector size of
295 the device, and C<$h-E<gt>blockdev_getsize64> for the more
296 useful I<size in bytes>.
298 This uses the L<blockdev(8)> command.
300 =item $h->blockdev_rereadpt ($device);
302 Reread the partition table on C<device>.
304 This uses the L<blockdev(8)> command.
306 =item $h->blockdev_setbsz ($device, $blocksize);
308 This sets the block size of a device.
310 (Note this is different from both I<size in blocks> and
311 I<filesystem block size>).
313 This uses the L<blockdev(8)> command.
315 =item $h->blockdev_setro ($device);
317 Sets the block device named C<device> to read-only.
319 This uses the L<blockdev(8)> command.
321 =item $h->blockdev_setrw ($device);
323 Sets the block device named C<device> to read-write.
325 This uses the L<blockdev(8)> command.
327 =item $content = $h->cat ($path);
329 Return the contents of the file named C<path>.
331 Note that this function cannot correctly handle binary files
332 (specifically, files containing C<\0> character which is treated
333 as end of string). For those you need to use the C<$h-E<gt>download>
334 function which has a more complex interface.
336 Because of the message protocol, there is a transfer limit
337 of somewhere between 2MB and 4MB. To transfer large files you should use
340 =item $checksum = $h->checksum ($csumtype, $path);
342 This call computes the MD5, SHAx or CRC checksum of the
345 The type of checksum to compute is given by the C<csumtype>
346 parameter which must have one of the following values:
352 Compute the cyclic redundancy check (CRC) specified by POSIX
353 for the C<cksum> command.
357 Compute the MD5 hash (using the C<md5sum> program).
361 Compute the SHA1 hash (using the C<sha1sum> program).
365 Compute the SHA224 hash (using the C<sha224sum> program).
369 Compute the SHA256 hash (using the C<sha256sum> program).
373 Compute the SHA384 hash (using the C<sha384sum> program).
377 Compute the SHA512 hash (using the C<sha512sum> program).
381 The checksum is returned as a printable string.
383 =item $h->chmod ($mode, $path);
385 Change the mode (permissions) of C<path> to C<mode>. Only
386 numeric modes are supported.
388 =item $h->chown ($owner, $group, $path);
390 Change the file owner to C<owner> and group to C<group>.
392 Only numeric uid and gid are supported. If you want to use
393 names, you will need to locate and parse the password file
394 yourself (Augeas support makes this relatively easy).
396 =item $output = $h->command (\@arguments);
398 This call runs a command from the guest filesystem. The
399 filesystem must be mounted, and must contain a compatible
400 operating system (ie. something Linux, with the same
401 or compatible processor architecture).
403 The single parameter is an argv-style list of arguments.
404 The first element is the name of the program to run.
405 Subsequent elements are parameters. The list must be
406 non-empty (ie. must contain a program name).
408 The C<$PATH> environment variable will contain at least
409 C</usr/bin> and C</bin>. If you require a program from
410 another location, you should provide the full path in the
413 Shared libraries and data files required by the program
414 must be available on filesystems which are mounted in the
415 correct places. It is the caller's responsibility to ensure
416 all filesystems that are needed are mounted at the right
419 =item @lines = $h->command_lines (\@arguments);
421 This is the same as C<$h-E<gt>command>, but splits the
422 result into a list of lines.
424 =item $h->config ($qemuparam, $qemuvalue);
426 This can be used to add arbitrary qemu command line parameters
427 of the form C<-param value>. Actually it's not quite arbitrary - we
428 prevent you from setting some parameters which would interfere with
429 parameters that we use.
431 The first character of C<param> string must be a C<-> (dash).
433 C<value> can be NULL.
435 =item $result = $h->debug ($subcmd, \@extraargs);
437 The C<$h-E<gt>debug> command exposes some internals of
438 C<guestfsd> (the guestfs daemon) that runs inside the
441 There is no comprehensive help for this command. You have
442 to look at the file C<daemon/debug.c> in the libguestfs source
443 to find out what you can do.
445 =item $h->download ($remotefilename, $filename);
447 Download file C<remotefilename> and save it as C<filename>
448 on the local machine.
450 C<filename> can also be a named pipe.
452 See also C<$h-E<gt>upload>, C<$h-E<gt>cat>.
454 =item $existsflag = $h->exists ($path);
456 This returns C<true> if and only if there is a file, directory
457 (or anything) with the given C<path> name.
459 See also C<$h-E<gt>is_file>, C<$h-E<gt>is_dir>, C<$h-E<gt>stat>.
461 =item $description = $h->file ($path);
463 This call uses the standard L<file(1)> command to determine
464 the type or contents of the file. This also works on devices,
465 for example to find out whether a partition contains a filesystem.
467 The exact command which runs is C<file -bsL path>. Note in
468 particular that the filename is not prepended to the output
471 =item $status = $h->fsck ($fstype, $device);
473 This runs the filesystem checker (fsck) on C<device> which
474 should have filesystem type C<fstype>.
476 The returned integer is the status. See L<fsck(8)> for the
477 list of status codes from C<fsck>, and note that multiple
478 status codes can be summed together.
480 It is entirely equivalent to running C<fsck -a -t fstype device>.
481 Note that checking or repairing NTFS volumes is not supported
484 =item $autosync = $h->get_autosync ();
486 Get the autosync flag.
488 =item $label = $h->get_e2label ($device);
490 This returns the ext2/3/4 filesystem label of the filesystem on
493 =item $uuid = $h->get_e2uuid ($device);
495 This returns the ext2/3/4 filesystem UUID of the filesystem on
498 =item $path = $h->get_path ();
500 Return the current search path.
502 This is always non-NULL. If it wasn't set already, then this will
503 return the default path.
505 =item $qemu = $h->get_qemu ();
507 Return the current qemu binary.
509 This is always non-NULL. If it wasn't set already, then this will
510 return the default qemu binary name.
512 =item $state = $h->get_state ();
514 This returns the current state as an opaque integer. This is
515 only useful for printing debug and internal error messages.
517 For more information on states, see L<guestfs(3)>.
519 =item $verbose = $h->get_verbose ();
521 This returns the verbose messages flag.
523 =item $busy = $h->is_busy ();
525 This returns true iff this handle is busy processing a command
526 (in the C<BUSY> state).
528 For more information on states, see L<guestfs(3)>.
530 =item $config = $h->is_config ();
532 This returns true iff this handle is being configured
533 (in the C<CONFIG> state).
535 For more information on states, see L<guestfs(3)>.
537 =item $dirflag = $h->is_dir ($path);
539 This returns C<true> if and only if there is a directory
540 with the given C<path> name. Note that it returns false for
541 other objects like files.
543 See also C<$h-E<gt>stat>.
545 =item $fileflag = $h->is_file ($path);
547 This returns C<true> if and only if there is a file
548 with the given C<path> name. Note that it returns false for
549 other objects like directories.
551 See also C<$h-E<gt>stat>.
553 =item $launching = $h->is_launching ();
555 This returns true iff this handle is launching the subprocess
556 (in the C<LAUNCHING> state).
558 For more information on states, see L<guestfs(3)>.
560 =item $ready = $h->is_ready ();
562 This returns true iff this handle is ready to accept commands
563 (in the C<READY> state).
565 For more information on states, see L<guestfs(3)>.
567 =item $h->kill_subprocess ();
569 This kills the qemu subprocess. You should never need to call this.
573 Internally libguestfs is implemented by running a virtual machine
576 You should call this after configuring the handle
577 (eg. adding drives) but before performing any actions.
579 =item @devices = $h->list_devices ();
581 List all the block devices.
583 The full block device names are returned, eg. C</dev/sda>
585 =item @partitions = $h->list_partitions ();
587 List all the partitions detected on all block devices.
589 The full partition device names are returned, eg. C</dev/sda1>
591 This does not return logical volumes. For that you will need to
594 =item $listing = $h->ll ($directory);
596 List the files in C<directory> (relative to the root directory,
597 there is no cwd) in the format of 'ls -la'.
599 This command is mostly useful for interactive sessions. It
600 is I<not> intended that you try to parse the output string.
602 =item @listing = $h->ls ($directory);
604 List the files in C<directory> (relative to the root directory,
605 there is no cwd). The '.' and '..' entries are not returned, but
606 hidden files are shown.
608 This command is mostly useful for interactive sessions. Programs
609 should probably use C<$h-E<gt>readdir> instead.
611 =item %statbuf = $h->lstat ($path);
613 Returns file information for the given C<path>.
615 This is the same as C<$h-E<gt>stat> except that if C<path>
616 is a symbolic link, then the link is stat-ed, not the file it
619 This is the same as the C<lstat(2)> system call.
621 =item $h->lvcreate ($logvol, $volgroup, $mbytes);
623 This creates an LVM volume group called C<logvol>
624 on the volume group C<volgroup>, with C<size> megabytes.
626 =item $h->lvm_remove_all ();
628 This command removes all LVM logical volumes, volume groups
629 and physical volumes.
631 B<This command is dangerous. Without careful use you
632 can easily destroy all your data>.
634 =item $h->lvremove ($device);
636 Remove an LVM logical volume C<device>, where C<device> is
637 the path to the LV, such as C</dev/VG/LV>.
639 You can also remove all LVs in a volume group by specifying
640 the VG name, C</dev/VG>.
642 =item @logvols = $h->lvs ();
644 List all the logical volumes detected. This is the equivalent
645 of the L<lvs(8)> command.
647 This returns a list of the logical volume device names
648 (eg. C</dev/VolGroup00/LogVol00>).
650 See also C<$h-E<gt>lvs_full>.
652 =item @logvols = $h->lvs_full ();
654 List all the logical volumes detected. This is the equivalent
655 of the L<lvs(8)> command. The "full" version includes all fields.
657 =item $h->mkdir ($path);
659 Create a directory named C<path>.
661 =item $h->mkdir_p ($path);
663 Create a directory named C<path>, creating any parent directories
664 as necessary. This is like the C<mkdir -p> shell command.
666 =item $h->mkfs ($fstype, $device);
668 This creates a filesystem on C<device> (usually a partition
669 of LVM logical volume). The filesystem type is C<fstype>, for
672 =item $h->mount ($device, $mountpoint);
674 Mount a guest disk at a position in the filesystem. Block devices
675 are named C</dev/sda>, C</dev/sdb> and so on, as they were added to
676 the guest. If those block devices contain partitions, they will have
677 the usual names (eg. C</dev/sda1>). Also LVM C</dev/VG/LV>-style
680 The rules are the same as for L<mount(2)>: A filesystem must
681 first be mounted on C</> before others can be mounted. Other
682 filesystems can only be mounted on directories which already
685 The mounted filesystem is writable, if we have sufficient permissions
686 on the underlying device.
688 The filesystem options C<sync> and C<noatime> are set with this
689 call, in order to improve reliability.
691 =item $h->mount_options ($options, $device, $mountpoint);
693 This is the same as the C<$h-E<gt>mount> command, but it
694 allows you to set the mount options as for the
695 L<mount(8)> I<-o> flag.
697 =item $h->mount_ro ($device, $mountpoint);
699 This is the same as the C<$h-E<gt>mount> command, but it
700 mounts the filesystem with the read-only (I<-o ro>) flag.
702 =item $h->mount_vfs ($options, $vfstype, $device, $mountpoint);
704 This is the same as the C<$h-E<gt>mount> command, but it
705 allows you to set both the mount options and the vfstype
706 as for the L<mount(8)> I<-o> and I<-t> flags.
708 =item @devices = $h->mounts ();
710 This returns the list of currently mounted filesystems. It returns
711 the list of devices (eg. C</dev/sda1>, C</dev/VG/LV>).
713 Some internal mounts are not shown.
715 =item $h->pvcreate ($device);
717 This creates an LVM physical volume on the named C<device>,
718 where C<device> should usually be a partition name such
721 =item $h->pvremove ($device);
723 This wipes a physical volume C<device> so that LVM will no longer
726 The implementation uses the C<pvremove> command which refuses to
727 wipe physical volumes that contain any volume groups, so you have
728 to remove those first.
730 =item @physvols = $h->pvs ();
732 List all the physical volumes detected. This is the equivalent
733 of the L<pvs(8)> command.
735 This returns a list of just the device names that contain
736 PVs (eg. C</dev/sda2>).
738 See also C<$h-E<gt>pvs_full>.
740 =item @physvols = $h->pvs_full ();
742 List all the physical volumes detected. This is the equivalent
743 of the L<pvs(8)> command. The "full" version includes all fields.
745 =item @lines = $h->read_lines ($path);
747 Return the contents of the file named C<path>.
749 The file contents are returned as a list of lines. Trailing
750 C<LF> and C<CRLF> character sequences are I<not> returned.
752 Note that this function cannot correctly handle binary files
753 (specifically, files containing C<\0> character which is treated
754 as end of line). For those you need to use the C<$h-E<gt>read_file>
755 function which has a more complex interface.
757 =item $h->rm ($path);
759 Remove the single file C<path>.
761 =item $h->rm_rf ($path);
763 Remove the file or directory C<path>, recursively removing the
764 contents if its a directory. This is like the C<rm -rf> shell
767 =item $h->rmdir ($path);
769 Remove the single directory C<path>.
771 =item $h->set_autosync ($autosync);
773 If C<autosync> is true, this enables autosync. Libguestfs will make a
774 best effort attempt to run C<$h-E<gt>umount_all> followed by
775 C<$h-E<gt>sync> when the handle is closed
776 (also if the program exits without closing handles).
778 This is disabled by default (except in guestfish where it is
781 =item $h->set_busy ();
783 This sets the state to C<BUSY>. This is only used when implementing
784 actions using the low-level API.
786 For more information on states, see L<guestfs(3)>.
788 =item $h->set_e2label ($device, $label);
790 This sets the ext2/3/4 filesystem label of the filesystem on
791 C<device> to C<label>. Filesystem labels are limited to
794 You can use either C<$h-E<gt>tune2fs_l> or C<$h-E<gt>get_e2label>
795 to return the existing label on a filesystem.
797 =item $h->set_e2uuid ($device, $uuid);
799 This sets the ext2/3/4 filesystem UUID of the filesystem on
800 C<device> to C<uuid>. The format of the UUID and alternatives
801 such as C<clear>, C<random> and C<time> are described in the
802 L<tune2fs(8)> manpage.
804 You can use either C<$h-E<gt>tune2fs_l> or C<$h-E<gt>get_e2uuid>
805 to return the existing UUID of a filesystem.
807 =item $h->set_path ($path);
809 Set the path that libguestfs searches for kernel and initrd.img.
811 The default is C<$libdir/guestfs> unless overridden by setting
812 C<LIBGUESTFS_PATH> environment variable.
814 The string C<path> is stashed in the libguestfs handle, so the caller
815 must make sure it remains valid for the lifetime of the handle.
817 Setting C<path> to C<NULL> restores the default path.
819 =item $h->set_qemu ($qemu);
821 Set the qemu binary that we will use.
823 The default is chosen when the library was compiled by the
826 You can also override this by setting the C<LIBGUESTFS_QEMU>
827 environment variable.
829 The string C<qemu> is stashed in the libguestfs handle, so the caller
830 must make sure it remains valid for the lifetime of the handle.
832 Setting C<qemu> to C<NULL> restores the default qemu binary.
834 =item $h->set_ready ();
836 This sets the state to C<READY>. This is only used when implementing
837 actions using the low-level API.
839 For more information on states, see L<guestfs(3)>.
841 =item $h->set_verbose ($verbose);
843 If C<verbose> is true, this turns on verbose messages (to C<stderr>).
845 Verbose messages are disabled unless the environment variable
846 C<LIBGUESTFS_DEBUG> is defined and set to C<1>.
848 =item $h->sfdisk ($device, $cyls, $heads, $sectors, \@lines);
850 This is a direct interface to the L<sfdisk(8)> program for creating
851 partitions on block devices.
853 C<device> should be a block device, for example C</dev/sda>.
855 C<cyls>, C<heads> and C<sectors> are the number of cylinders, heads
856 and sectors on the device, which are passed directly to sfdisk as
857 the I<-C>, I<-H> and I<-S> parameters. If you pass C<0> for any
858 of these, then the corresponding parameter is omitted. Usually for
859 'large' disks, you can just pass C<0> for these, but for small
860 (floppy-sized) disks, sfdisk (or rather, the kernel) cannot work
861 out the right geometry and you will need to tell it.
863 C<lines> is a list of lines that we feed to C<sfdisk>. For more
864 information refer to the L<sfdisk(8)> manpage.
866 To create a single partition occupying the whole disk, you would
867 pass C<lines> as a single element list, when the single element being
868 the string C<,> (comma).
870 B<This command is dangerous. Without careful use you
871 can easily destroy all your data>.
873 =item %statbuf = $h->stat ($path);
875 Returns file information for the given C<path>.
877 This is the same as the C<stat(2)> system call.
879 =item %statbuf = $h->statvfs ($path);
881 Returns file system statistics for any mounted file system.
882 C<path> should be a file or directory in the mounted file system
883 (typically it is the mount point itself, but it doesn't need to be).
885 This is the same as the C<statvfs(2)> system call.
889 This syncs the disk, so that any writes are flushed through to the
890 underlying disk image.
892 You should always call this if you have modified a disk image, before
895 =item $h->tar_in ($tarfile, $directory);
897 This command uploads and unpacks local file C<tarfile> (an
898 I<uncompressed> tar file) into C<directory>.
900 To upload a compressed tarball, use C<$h-E<gt>tgz_in>.
902 =item $h->tar_out ($directory, $tarfile);
904 This command packs the contents of C<directory> and downloads
905 it to local file C<tarfile>.
907 To download a compressed tarball, use C<$h-E<gt>tgz_out>.
909 =item $h->tgz_in ($tarball, $directory);
911 This command uploads and unpacks local file C<tarball> (a
912 I<gzip compressed> tar file) into C<directory>.
914 To upload an uncompressed tarball, use C<$h-E<gt>tar_in>.
916 =item $h->tgz_out ($directory, $tarball);
918 This command packs the contents of C<directory> and downloads
919 it to local file C<tarball>.
921 To download an uncompressed tarball, use C<$h-E<gt>tar_out>.
923 =item $h->touch ($path);
925 Touch acts like the L<touch(1)> command. It can be used to
926 update the timestamps on a file, or, if the file does not exist,
927 to create a new zero-length file.
929 =item %superblock = $h->tune2fs_l ($device);
931 This returns the contents of the ext2, ext3 or ext4 filesystem
932 superblock on C<device>.
934 It is the same as running C<tune2fs -l device>. See L<tune2fs(8)>
935 manpage for more details. The list of fields returned isn't
936 clearly defined, and depends on both the version of C<tune2fs>
937 that libguestfs was built against, and the filesystem itself.
939 =item $h->umount ($pathordevice);
941 This unmounts the given filesystem. The filesystem may be
942 specified either by its mountpoint (path) or the device which
943 contains the filesystem.
945 =item $h->umount_all ();
947 This unmounts all mounted filesystems.
949 Some internal mounts are not unmounted by this call.
951 =item $h->upload ($filename, $remotefilename);
953 Upload local file C<filename> to C<remotefilename> on the
956 C<filename> can also be a named pipe.
958 See also C<$h-E<gt>download>.
960 =item $h->vgcreate ($volgroup, \@physvols);
962 This creates an LVM volume group called C<volgroup>
963 from the non-empty list of physical volumes C<physvols>.
965 =item $h->vgremove ($vgname);
967 Remove an LVM volume group C<vgname>, (for example C<VG>).
969 This also forcibly removes all logical volumes in the volume
972 =item @volgroups = $h->vgs ();
974 List all the volumes groups detected. This is the equivalent
975 of the L<vgs(8)> command.
977 This returns a list of just the volume group names that were
978 detected (eg. C<VolGroup00>).
980 See also C<$h-E<gt>vgs_full>.
982 =item @volgroups = $h->vgs_full ();
984 List all the volumes groups detected. This is the equivalent
985 of the L<vgs(8)> command. The "full" version includes all fields.
987 =item $h->wait_ready ();
989 Internally libguestfs is implemented by running a virtual machine
992 You should call this after C<$h-E<gt>launch> to wait for the launch
995 =item $h->write_file ($path, $content, $size);
997 This call creates a file called C<path>. The contents of the
998 file is the string C<content> (which can contain any 8 bit data),
1001 As a special case, if C<size> is C<0>
1002 then the length is calculated using C<strlen> (so in this case
1003 the content cannot contain embedded ASCII NULs).
1005 Because of the message protocol, there is a transfer limit
1006 of somewhere between 2MB and 4MB. To transfer large files you should use
1009 =item $h->zero ($device);
1011 This command writes zeroes over the first few blocks of C<device>.
1013 How many blocks are zeroed isn't specified (but it's I<not> enough
1014 to securely wipe the device). It should be sufficient to remove
1015 any partition tables, filesystem superblocks and so on.
1025 Copyright (C) 2009 Red Hat Inc.
1029 Please see the file COPYING.LIB for the full license.
1033 L<guestfs(3)>, L<guestfish(1)>.